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Biology subjects

Kaida, D.

Publications and source records attributed to Kaida, D..

2 recordsLinked to original sources

CGK733 binds to adenine nucleotide translocator 2 and modulates mitochondrial function and protein translation

Chemical genetics is a powerful strategy for dissecting biological mechanisms, and a crucial step in this approach is to identify the molecular target responsible for a compounds activity. CGK733, a compound with anti-proliferative activity, was once reported as an ATM/ATR inhibitor, although this activity has been debated, and its target and mode of action have remained unclear. Here, we show that CGK733 inhibits cell-cycle progression and global protein translation. Affinity purification identified adenine nucleotide translocator 2 (ANT2) as the primary target. CGK733 blocked ATP export from mitochondria and induced proton leak, thereby shifting ATP production from mitochondrial respiration to glycolysis and perturbing the TCA cycle. These mitochondrial alterations were accompanied by inactivation of the mTOR pathway and mild activation of the integrated stress response, resulting in translational inhibition. Collectively, our findings demonstrate that CGK733 acts mainly through ANT2-dependent mitochondrial modulation, revealing a mechanistic link between mitochondrial bioenergetics and translational control.

biochemistry↗

A truncated form of the p27 CDK inhibitor translated from pre-mRNA causes cell cycle arrest at G2 phase

Pre-mRNA splicing is an indispensable mechanism for eukaryotic gene expression. Splicing inhibition causes cell cycle arrest at G1 and G2/M phases, which is thought to be one of the reasons for the potent antitumor activity of splicing inhibitors. However, the molecular mechanisms underlying the cell cycle arrest have many unknown aspects. In particular, the mechanism of G2/M-phase arrest caused by splicing inhibition is completely unknown. Here, we found that lower and higher concentrations of pladienolide B caused M-phase and G2-phase arrest, respectively. We analyzed protein levels of cell cycle regulators and found that a truncated form of the p27 CDK inhibitor, named p27*, accumulates in G2-arrested cells. Overexpression of p27* caused partial G2-phase arrest. Conversely, knockdown of p27* accelerated exit from G2/M phase after washout of splicing inhibitor. These results suggest that p27* contributes to G2/M-phase arrest caused by splicing inhibition. We also found that p27* bound to and inhibited M-phase cyclins, although it is well known that p27 regulates G1/S transition. Intriguingly, p27*, but not full-length p27, was resistant to proteasomal degradation and remained in G2/M phase. These results suggest that p27*, which is a very stable truncated protein in G2/M phase, contributes to G2-phase arrest caused by splicing inhibition.

molecular biology↗